/* Teach Tool  - Structural Dynamics
 * Copyright (C) 2009: Fabian Gerold, www.fabiangerold.de
 *
 * This file may be licensed under the terms of of the
 * GNU General Public License Version 3 (the "GPL").
 * 
 * Software distributed under the License is distributed 
 * on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either 
 * express or implied. See the GPL for the specific language 
 * governing rights and limitations.
 *
 * You should have received a copy of the GPL along with this 
 * program. If not, go to http://www.gnu.org/licenses/gpl.html
 * or write to the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/

#ifndef ISD_SPRINGDAMP_H
#define ISD_SPRINGDAMP_H

#include <QGraphicsItem>
class System;

class SpringDamp : public QGraphicsItem
{
public:
	SpringDamp();
	QRectF boundingRect() const;
	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
	void initPos( qreal x, qreal y );
	void setDisp( double disp, double ground_disp );
	void resetDisp();
	void setSpring( double k );
	void setDamp( double d );
	
private:
	System* m_system;
	double	m_disp;
	double	m_disp_old;
	double	m_ground_disp;
	double	m_ground_disp_old;
	double	m_amp;
	double	m_amp_disp;
	double	m_amp_disp_old;
	double	m_scale_spring;
	double	m_scale_damp;
	float	m_w;
};

#endif
